/*
 * Copyright 2018 StreamSets Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.streamsets.pipeline.lib.csv;

import com.streamsets.pipeline.api.impl.Utils;

import java.io.Closeable;
import java.io.IOException;
import java.io.Reader;

public interface DelimitedDataParser extends Closeable {
  default long skipLines(Reader reader, int lines) throws IOException {
    int count = 0;
    int skipped = 0;
    while (skipped < lines) {
      int c = reader.read();
      if (c == -1) {
        throw new IOException(Utils.format("Could not skip '{}' lines, reached EOF", lines));
      }
      // this is enough to handle \n and \r\n EOL files
      if (c == '\n') {
        skipped++;
      }
      count++;
    }
    return count;
  }

  String[] getHeaders() throws IOException;
  String[] read() throws IOException;
  long getReaderPosition();
  void close() throws IOException;
}
